Littoral warfare is rarely a shoot-fest. Yes, small craft would be outgunned against warships and helicopters, but those craft aren't going to directly engage. They mostly smuggle and network, and when they attack, they attack soft targets. Hellfires and Mavericks aren't always the right tools for the job, and even when they are, it's hard to know where to use them. All things considered, the littoral environment is far more challenging for the US Navy than blue water ops are. (And regarding blue water ops... have you noticed that we've paid a lot of attention to China?)
As for the submarine aspect, we easily have over 90% of the world's combat submarines already modeled.
__________________
|